Questions & answers for Chapter 6 Changes around us

Chapter 6 Changes around us Questions and Answers for class 6 Science

Find below Important MCQ-based objective questions for Chapter 6 Changes around us prepared for CBSE students. All the syllabus of Class 6 Science Chapter 6 Changes around us is covered with questions and answers. Each question is explained with a detailed solution. The entire syllabus of Chapter 6 Changes around us is covered in the following worksheet for class 6 science. For more worksheets for class 6 science click on the link and do check out NCERT solutions for class 6 science. 

Find below Class 6 Science Chapter 6 Changes around us Questions & Answer

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Class 6 Science Chapter 6 Changes around us Questions & Answer Set-1

Science - MCQ on Changes Around Us

Class VI

Q.1.Which of the following is not a man-made change? (1 Mark)

a. Formation of curd from milk

b. Burning of fuels

c. Drying of cloths

d. Change of Seasons

Answer:

(D) Change of Seasons

Explanation- Change of Seasons is a natural change as it occurs in nature on its own. We have no control over natural changes.

Q.2. Formation of coal is a – (1 Mark)

a. Fast change

b. Slow change

c. Periodic change

d. None of these

Answer:

(B) Slow change

Explanation- Coal formation is a slow change because it takes place over a long period of time.

Q.3. Chemical changes are- (1 Mark)

a. always irreversible.

b. always reversible.

c. mostly irreversible.

d. mostly reversible.

Answer:

(A) always irreversible.

Explanation-Achemical Change is a permanent change. It cannot be reversed by just reversing the conditions.

Q.4.Which of the following is not an example of physical change? (1 Mark)

a. Tearing of Paper

b. Solution of sugar in water

c. Cooking of food

d. Glowing of a tube light

Answer:

(C) Cooking of food

Explanation- Cooking of food is a chemical change as it cannot be reversed.

Q.5. Bursting of a cracker is a- (1 Mark)

a. Physical change.

b. Fast change.

c. Periodic change.

d. Slow change.

Answer:

(B) Fast change

Explanation- Bursting of a cracker is a fast change as it occurs within a very short time.

Q.6.Which of the following is an irreversible change? (1 Mark)

a. Rottening of bread

b. Tearing of cloth

c. Cold water to hot water

d. Melting of ice

Answer:

(A) Rottening of bread

Explanation- Bread cannot be converted into fresh bread after rottening of it. So, it is an irreversible charge.

Q.7.A change which occurs during a definite time interval is called-

a. Chemical change

b. Desirable change

c. Periodic change

d. Fast change (1 Mark)

Answer:

(C) Periodic change

Explanation- Periodic change is a change that occurs during a definite interval of time e.g. heart-beat.

Q.8.Taking a Photograph is a -

a. Fast change

b. Slow change

c. Periodic change

d. None of these

Answer:

(A) Fast change

Explanation- Taking a photograph is a fast change as it occurs within a few seconds.

Q.9. Find the odd one out- (1 Mark)

a. Volcanic eruption

b. Preparation of food by green plants

c. Burning of candle

d. Formation of clouds

Answer:

(D) Formation of clouds

Explanation- Formation of clouds is a physical change while others are chemical changes.

Q.10. Germination of seed is a – (1 Mark)

a. Slow change

b. Fast change

c. Reversible change

d. None of these

Answer:

(A) Slow change

Explanation- Germination of seed is a slow change as it takes a long time to occur.

Q.11.Which of the following is a true statement? (1 Mark)

a. Rusting of iron is a physical change.

b. Bursting of an inflated balloon is an undesirable reversible change.

c. All irreversible changes are chemical changes.

d. Breaking of china dish is a chemical change.

Answer:

(C) All irreversible changes are chemical changes.

Explanation- All irreversible changes are permanent changes. They cannot be reversed. So, these changes are chemical changes.

Q.12.Which of the following is not an example of desirable change? (1 Mark)

a. Formation of manure from animal dung.

b. Turning of milk into curd.

c. Cleaning of utensils.

d. Flooding of rivers.

Answer:

(D) Flooding of rivers

Explanation- Flooding of rivers is not useful to us. It can damage lives, crops etc., so it is an undesirable change.

Class 6 Science Chapter 6 Changes around us Questions & Answer Set-2

Q.13.Which of the following is not true for a physical change? (1 Mark)

a. Physical change is reversible.

b. No new substance is formed.

c. Physical change is a permanent change.

d. The original form of the substance can be obtained easily by simple physical methods.

Answer:

(C) Physical change is a permanent change.

Explanation- Physical change is a temporary change. It can be easily reversed by reversing the conditions.

Q.14.Changes can caused by-

a. Heating

b. Mixing

c. Force

d. All the above

Answer:

(D) All the above

Explanation- Changes can be caused by mixing, heating or by applying force.

Q.15. Formation of curd from milk is- (1 Mark)

a. a desirable and a chemical change.

b. a slow and an irreversible change.

c. both (A) and (B)

d. none of these.

Answer:

(C) both (A) and (B)

Explanation- Formation of curd from milk is a slow, irreversible, desirable and a chemical charge.

Q.16. Find the odd one out- (1 Mark)

a. Ploughing of a field

b. Ageing of a man

c. Burning of a Paper

d. Grain to its flour

Answer:

(A)Ploughing of a field

Explanation- Ploughing of a field is a reversible change while others are irreversible changes.

Q.17. Motion of a pendulum in a clock is an example of- (1 Mark)

a. Chemical change.

b. Irreversible change.

c. Periodic change

d. Non periodic change

Answer:

(C) Periodic change

Explanation- Motion of a pendulum is a periodic change as it occurs during a definite time interval.

Q.18.Formation of paneer from milk is a - (1 Mark)

a. Physical change

b. Chemical change

c. Reversible change

d. None of these

Answer:

(B) Chemical change

Explanation- Milk to paneer formation is a chemical change because paneer cannot be converted into milk again.

Q.19.The change where energy evolved is called as- (1 Mark)

a. Exothermic change

b. Endothermic change

c. Physical change

d. None of these

Answer:

(A) Exothermic change.

Explanation- In exothermic change, energy is released.

Q.20.What happens when an iron piece is heated? (1 Mark)

a. It expands

b. It contracts

c. Both (A) and (B)

d. Neither expands nor contracts

Answer:

(A) It expands

Explanation- On heating iron piece, it melts and expands. It contracts on cooling.

Q.21.Conversion of a solid into liquid by heating is known as- (1 Mark)

a. Freezing

b. Condensation

c. Melting

d. Vaporization

Answer:

(C) Melting.

Explanation-Melting is the conversion of a solid into liquid by heating. The temperature at which a solid substance melts and changes into a liquid at atmospheric pressure is called melting point of the substance.

Q.22.The process in which a liquid changes into its vapours (gas) on heating is called as – (1 Mark)

a. melting

b. freezing

c. boiling

d. none of these

Answer:

(A) Boiling

Explanation- Boiling or vaporization is a process in which a liquid changes into its vapours on heating. A change of state takes place during boiling. The boiling occurs at a fixed temperature (boiling point).

Q.23.The change where energy is absorbed is known as - (1 Mark)

a. exothermic change

b. endothermic change

c. periodic change

d. none of these

Answer:

(B) Endothermic change

Explanation- In endothermic change, energy is absorbed.

Q.24.Which of the following statements is the false statement?

a. Tooth decay is a slow change.

b. Burning of match stick is a fast change.

c. Weathering of rocks is an irreversible change.

d. Breaking of a clay toy is a chemical change.

Answer:

(D) Breaking of a clay toy is a chemical change.

Explanation- Breaking of a clay toy is a physical change as the toy can again make by the clay.

Q.25.Match the items of column `A’ with the items of column `B’ (1 Mark)

Column A	Column B
I Salt	a. Chemical change
II Air	b. dissolves easily in water
III Phases of moon	c. can be compressed easily
IV Photosynthesis	d. Periodic changes

a. I - b, II – c, III – d, IV - a

b. I – a, II – c, III – b, IV – d

c. I – b, II – d, III – c, IV – a

d. I – d, II – c, III – b, IV – a

Answer:

(A) I - b, II– c, III– d, IV– a

Explanation- Salt is soluble in water. Air can be compressed easily. Phases of moon are periodic changes and photosynthesis is a chemical change as new products (glucose and oxygen) are formed.